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The wave-particle duality of light has led to two different encodings for optical quantum information processing. We report here the remote generation of entanglement between particle-like discrete-variable qubits and wave-like continuous-variable qubits.
Single-photon entangled states, i.e. states describing two optical paths sharing a single-photon, constitute the simplest form of entanglement. Yet they provide a valuable resource in quantum information science. Specifically, they lie at the heart of quantum networks, as they can be used for quantum teleportation, swapped and purified with linear optics. The main drawback of such entanglement is...
The ability to engineer various quantum states of light is a central requirement for quantum information processing, including quantum communication, computing and metrology. In this endeavor, many experiments use the so-called conditional preparation technique. The dynamic of the heralded states, i.e. its temporal mode, mainly depends on the setup and has been studied theoretically with different...
We demonstrate a novel trustworthy witness for single-photon entanglement based only on local homodyne measurements. This operational test is well suited for quantum networks, and highlights the potential of the optical hybrid approach.
Correlations of twin beams generated by parametric down-conversion are quantitatively determined by two-photon counting interferometery. Compared with incoherent light, photon extrabunching at the fs scale is unambiguously and precisely measured.
We use a modified Hanbury Brown-Twiss set-up based on two-photon absorption to study second-order coherence of parametric fluorescence at the femtosecond scale. Characterizations are made in the degenerate case and far away degeneracy.
Two-photon counting distributions of different optical sources are experimentally studied using third-order optical nonlinearity in a GaAs detector. Semiclassical as well as quantum theories are presented in order to explain our results.
We show that photon quantum correlations can be measured by two photon absorption in semiconductors. Hanbury-Brown Twiss experiments can thus be performed with genuine blackbodies with a time resolution in the femtosecond range.
The second-order coherence properties of highly-incoherent cw sources (true blackbody and amplified spontaneous emission) are directly evidenced at femtosecond timescales by use of an interferometric autocorrelator based on a two-photon absorption in a GaAs phototube.
Photon bunching in highly chaotic sources (true blackbody and amplified spontaneous emission) is detected for the first time with femtosecond temporal resolution by use of a Hanbury-Brown-Twiss experiment relying on two-photon absorption in semiconductors.
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